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Non-current assets - property, plant and equipment - Summary of reconciliations of property, plant and equipment (Detail) - AUD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance $ 1 $ 490  
Additions   9  
Disposals (1) (144)  
Impairment of assets (1) (143)  
Depreciation expense   (211) $ (99)
Ending balance   1 490
Leasehold improvements [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance   384  
Additions   7  
Disposals   (56)  
Impairment of assets   (143)  
Depreciation expense   (192) (52)
Ending balance     384
Plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 1 106  
Additions   2  
Disposals $ (1) (88)  
Depreciation expense   (19) (47)
Ending balance   $ 1 $ 106